Feat/use latest nrfutil URLs

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[kylebonnici]

@datenreisender after further testing the / 100 was not needed. the issue is that mtimeMs give a decimal and comparing two decimal will not guarantee === due to floating point errors. rounding solves the issues

[kylebonnici]

For what bug/use case do we need to check that the time stamps in the used and bundled nrfutil are the same?

I expected the check to be “if the bundled version is newer” but it is more like “if the bundled version is different”. Is there a case, where we might want to overwrite with an older version?

I assume when we run nrfutil self-upgrade, the time stamps do not get overwritten?

BTW: Is fs-extra needed for these operations? Nowadays fs-extra seems mostly like an unneeded dependency, so I would like to move away from it, but this doesn't have a high priority for me.

re fs-exter we can move away, I did not pay attention to which one I used to be honest. re self-upgrade will update the core in the sandbox and not the wrapper we ship so no self-upgrade will not overwrite the nrfutil we bundle re check we can overwrite if the one on disk is older and not different :)